Pipe coil for use in refrigeration systems



March 31. 1925. 4

. M. F. PQSTLEWAITE ET AL PIPE COIL FOR'USE INREFRIGERATION SYSTEMSFiled April 23 2 Sheets-Sheet 1 March 31. 1925. 1,532,076

M. F. POSTLEWAITE ET AL- PIPE COIL FOR USE IN REFRIGERATION SYSTEMSFiled April 18, 1923 2 Sheets-Sheet 2 lwvewto o Lawsorv Patented Mar.31, 1925 UNITED STATES 1,532,076 PATENT OFFICE. I

llllIARK I. POSTLEWAITE AND TROY V LAWSON, OF SAN ANTONIO,

Taxes:

PIPE COIL FOR USE IN REFRIGERATION SYSTEMS.

t Application filed April .18, 1923. s er ial No. 632,926.

To all 'wliom it may concern:

Be it knownthat we, MARK F. Pos'rnn- .WAlTE and TROY V. LAWSON, citizensof the i is a specification.

Our invention relates to improvements'in pipe coils and moreparticularlyto pipe coils for use in refrigeration systems, although wedo not wish to be limited to this particular use.

One of the primary objects of the invention is toprovide a pipe coil forrefrigeration systems which. is especially adapted either for use in afreezing tank, as a condenser coil, or as a direct expansion coil.

A further object of the invention is to provide a pipe coil of the abovedescribed character which, when installed in the freezing tank, makespossible the in'stallw tion of a materially greater evaporatin surfacethan is possible with any other type of-pipe coil now in use, andwhichevaporates the maximum amount of ammonia per square foot of surface at aminimum difference in temperature. j

A further object of the invention is to provide apipe-coil for use in afreezing tank which permits of the removal of tlie ammonia gas atminimum velocities.

A further object of the invention is to provide'a coil of the abovedescribed character for use in freezing tanks which can be made ofsuitable size and shape to fit any size tank, and which. is adapted tobe assembled therein without the use of screw or acked joints. I

A further object of this invention is to provide a pipe coil for use asabove described, which eliminates the possibility of breakage by the icecans,- wh1ch breakage causes the loss of a large" part of the chargeThis coil additionally provides supports for the frame work and cancovers of the tank and requires no extra support for itself. Otherobjects will be inpart obvious from the annexed drawingsand in partindicated from the following analysi's'of the invention. The inventionaccordingly consists in the features 6f construction, combination ofparts, andin the uniqfile relation of the various members and terelativeproporpreferred form of coil arrangement;

thereof; and Y is evident that the pipes'13 may ti oiling anddispositioiiing thereof, all as more clearly outlined herein.

To enable others skilled in the art to fully comprehend the underlyingfeatures thereof,

in order that they may embody the same, by

numerous modifications in structure and relation contemplated by thisinvention, drawings depicting the preferred forms have been annexed aspart of this disclosure and in such drawings like characters ofreference indicate corresponding parts throughout all the views, ofwhich-- Figure 1 is a side elevation of a part of a Figure 2 is a detailof a preferred form of joint; and

Figure 3 is a partial plan view of the freezing tank and refrigeratingsections a -Figurea is a perspective of the coil when used as acondenser coil. Referring now to the drawings, wherein is shown ourimproved type of coil applied to a freezing tank, and more particularlyso to Figure'1, the numeralslO and 11 indioate horizontal tubularheaders positioned parallel to 'each other and spaced apart a distancesuitable'to the depth ofthe tank used. A series of parallel pipes 13connect these tubular headers and are referably arranged perpendicularthereto,

a though-it be positioned at an angle greater or less than the verticalI with respect to the aforesaid I headers if desired.

Referring to Figure 2, the joints 14 of the headers and the verticalpipes are preferably formed by welding, either electric oxy-acetylene orby butt Welding, although it is evident that the headers and vertical*pipes may be cast integrally. This type of connection forms in a.refrigeration system a positive means of eliminating leakage of theammonia gas with its very-harmful 1 o effects to the system andinconvenience 1H attendance. K

1 Referring now to Figure 3, wherein is. shown the preferred arrangementin freezing tank, a seriesof horizontal headersiuoe 16 and I7-are-positioned longitudinally in a tank 15 which is substantiallyrectangular,

as has been found practical in use, each series; consisting of anupperand lower header in the same vertical plane. A number of sectionsof the pipe 00115, as shown in Figure 1, comprising the horizontal llO ,thereof, as 1s very frequently the case when pletely drained of theammonia gas, and

p with reference to the 45 and the c cle of o 50 such 50 type shown inFigure tors the end of the'top horizonta tem hare also preferably weldedto elemina-te,

at t

is point,any leakage of ammonia gas. The liquid ammonia is fed into theend of the bottom headers opposite the gas outlet ofthe suction or topheader. Suflicient amtheliquid level. approximately half way up thevertical pipes, in which pipes the liquid is evaporated and theresulting gas conveyed out o 'pressor' the tank and to the ammonia com-'by the .upper' horizontal headers. The ammonia gas thus'circulatinthrough the pipe coil abstracts heat from tfie cooling or calciumchloride,

to a degree necessary to freeze the water in ice cans placed in thecompartments 21. It is evident that the above described arrangeof thesystem.

he arrangement-of vertical pipes has the further advantage of preventingthe cans, plzooess of being inserted, from pipes and causing breakageThe ammonia gas islet oif from the 'discharge end of the coil back tothe compressor eration is again commenced. t is also 0 vious that thearrangewould require only a difference in esign.

he peculiar arran ement of horizontal has been found by practice to be.equally adaptable for use as denser coil and in a direct expansionsystem.

In Figure 4 is shown the preferred arrangement of this type of coil whenused as a'condenser. In this form of use, coils of the 1 are preferablyconnected up in pairs, one coil being of standard height and the otherbeing approximately one-halfas-high as itscompamon coil. The "hotgas-from the ammonia. compressor-enheader 10 to the bottom horizontalheader same temperature, in sufficient quantities to cool and liquefythe ammonia gas. As in the prior arrangements of coil described, thejoints are all preferably welded.

.With the direct expansion system, the i' must joints present materiallygreater advantages than types of coils in w ichthe joints are packed orscrew joints. The use to which this direct expansion system is usuallyput, namely, the cooling of storage rooms, necessitates a positivelyleakage-proof system, and our proposed type of coil is one which ispeculiarly adapted for such use in that, as hereinbefore stated, the

possibility of nated. a

From the above, it Wl ll be evident that our-improved type of pipe coilsfor use in refrigeration systems furnish many advan- It will thus vgreater evaporating surface than is possible with the older forms ofpipe coil. Further, by the use of the vertical pipes connecting-thehorizontal headers, an arrangement is provided whereby in case ofbreakage of any of the 7 parts the system may be easily and comquestionof practical design, embodies advantages in ease of installation minimumpossibility of breakage,

. and simplicity of installation.

ithout further analysis, the foregoing will so fully reveal the gist ofthis invention t that others can, by app ying current knowledge, readilyadapt it for various applicageneric or specific aspects of thisinvention and, therefore, such adaptations should and are intended tobecomprehended within the meaning and range of equivalency of thefollowing claims.

We claim:

. 1. In a refrigeration s stem, in combination with a freezing tanlz, apipe coil comprising upper and lower horizontal headers and a pluralitof pipe'sections connected therewith and arranged substantially at tointerposed sect ons comprising upper and lowerhorizontal headers andvertical connecting tubes.

2. In a refrigeration system, incombination with a freezing tank, a pipecoil com prising upper and lower horizontal headers positioned in thesame vertical plane and extending centrally through said tank, and aplurality of pipe sections connected to said headers and arrangedsubstantially at right angles thereto, said sections being spaced apartto permit an ice can to be interposed therebetween, and comprising up)er and lower headers and a plurality of tu esconnecting said last-namedheaders.

:3. In a refrigeration system, in combination with a freezing tank,upper and lower horizontal headers positioned in the same vertical planeand extending centrally through said tank, a plurality of vertical tubesconnecting said headers, and a plurality of pipe sections connected tosaid headers andextending on each side thereof, said sections beingspaced from each other to permit an ice can to be interposed therebetween, each of said sections comprising upper and lowerv horizontalheaders and vertical connecting tubes.

4. In a refrigeration system, in combination with a freezing tank, apipe coil comprising upper and lower horizontal headers and a pluralityof pipe sections connected therewith and arranged substantially at rightangles thereto; said sections being spaced from each other to permit anice can to be interposed thercbetween, said'pipe sectionscomprisinguppe'r and lower horizontal headers and pa 'allel connectingtubes, all of the joints between said headers and connect ing tubesbeing welded thereby to eliminate leakage therebetween.

5. In an ice making system, in combination, a tank adapted to contain afreezing medium therein, upper and lower horizonta headers within saidtank and extending centrally with relation thereto adapted to contain aliquid refrigerant to abstract heat,

upon evaporation thereof from said cooling medium, parallel, verticalpipes connecting said headers, and a plurality of ipe sections connectedto said headers, and positioned sul'istantially at right angles thereto,said sections being spaced apart to permit an ice ,thereof from saidcooling medium, parallel pipes connecting said headers, and a pluralityof pi e sections connected to said headers, an positioned Substantiallyat right angles thereto, said sections being spaced apart to permit anice can to be interposed thcrebetween, said sections compr1sing upperand lower horizontal headers and connecting pipes, all of said headersand pipes being welded at their connecting 'oints. Signed at SanAntonio, Texas, this 2nd day of April, 1923.

, MARK. .POSTLEWAITE.

-- TROY v. LAWSON.

